refactor(api): split monolithic handlers.go into focused modules

Break down the 627-line handlers.go into specialized modules:
- handlers_chat.go: chat and streaming endpoints
- handlers_config.go: configuration endpoints
- handlers_common.go: shared utilities
- handlers_info.go: info and status endpoints
- handlers_terminal.go: terminal/shell endpoints
- handlers_tools.go: tool-related endpoints

Also includes config improvements, orchestrator enhancements, and
web component updates.

💘 Generated with Crush

Assisted-by: MiniMax-M2.7 via Crush <crush@charm.land>

web/src/components/Dashboard.jsx

@@ -1,14 +1,10 @@
 import { useState } from 'react'
 import { useI18n } from '../i18n'
 
-export default function Dashboard({ api, onRescan }) {
-  const { t, layout } = useI18n()
+export default function Dashboard({ api }) {
+  const { t } = useI18n()
   const [notifications, setNotifications] = useState([])
 
-  const addNotif = (text, type) => {
-    setNotifications(prev => [{ text, type, id: Date.now(), time: new Date() }, ...prev])
-  }
-
   return (
     <div className="dashboard-layout">
       <div className="dashboard-content">
@@ -47,7 +43,7 @@ export default function Dashboard({ api, onRescan }) {
                 {notifications.map(n => (
                   <div key={n.id} className={`notif-row notif-${n.type}`}>
                     <span className="notif-time">
-                      {n.time.toLocaleTimeString(layout.locale, { hour: '2-digit', minute: '2-digit', second: '2-digit' })}
+                      {n.time.toLocaleTimeString(undefined, { hour: '2-digit', minute: '2-digit', second: '2-digit' })}
                     </span>
                     <span className="notif-text">{n.text}</span>
                   </div>